Add the onions to the hot pan. Sprinkle in the salt and cayenne pepper. Stir them to coat every single piece.

Cook the onions for thirty minutes. Stir them every few minutes carefully. Watch them turn a deep gold color.

Remove the pan from the heat. Let the onions cool down completely. This prevents the cream base from melting.

Place the cream cheese in a bowl. Add the sour cream and mayonnaise now. Use the mixer to make it smooth.

Fold the cooled onions into the mixture. Stir gently with your wooden spoon. Add a little extra pepper if desired.

Cover the bowl with plastic wrap. Put it in the fridge for hours. This lets the flavors marry together well.